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• Check the pH of the circulating water and, if necessary,
adjust it to 7.0-7.6. Then, running the pump only, treat
the system with sodium hypochlorite to maintain a level
of 4 to 5 mg/l (ppm) free chlorine (as Cl2) over a six
hour period. Test kits for measuring the free residual of
chlorine are commercially available. Start the fan only
after this treatment period is completed.
• When it is not practical to drain the system during shut-
down periods, install a by-pass line with shut-off valves
to permit the re-circulating water to circulate throughout
the system, including the unit basin, while bypassing
the Prime Surface Coil section of the evaporative cooling
equipment (fans should remain off).
• Treat the system as per one of the above described
methods prior to restarting the unit.
Corrosion and Scale Control
Biological Control
M A R 1 0 8 - 2
W W W . B A L T I M O R E A I R C O I L . C O M . A U
29
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